if you really must dye something, use SEM dye. It can be found online, or at part stores like car quest.
but IMHO, i would stay away. we had a truck come in that the owner tried to dye his interior. well, i'll let the pics do the talking.
do it once by doing it the right way. if you have ever put armor all on any of your interior plastics, you need to start scrubbing them everyday for the next month to get all the silicone off. silicone and paint = fish eyes. fish eyes look horrible.